<!-- 主页 -->
<template>
  <div id="homePage">
    <!-- 搜索框 -->
    <div class="search-bar">
      <a-input-search
        placeholder="从海量图片中搜索"
        v-model:value="searchParams.searchText"
        enter-button="搜索"
        size="large"
        @search="doSearch"
        allowClear
      />
    </div>

    <!-- 分类 + 标签 -->
    <a-tabs v-model:activeKey="selectedCategory" @change="doSearch">
      <a-tab-pane key="all" tab="全部" />
      <a-tab-pane v-for="category in categoryList" :key="category" :tab="category" />
    </a-tabs>
    <div class="tag-bar">
      <span style="margin-right: 8px">标签：</span>
      <a-space :size="[0, 8]" wrap>
        <a-checkable-tag
          v-for="(tag, index) in tagList"
          :key="tag"
          v-model:checked="selectedTagList[index]"
          @change="doSearch"
        >
          {{ tag }}
        </a-checkable-tag>
      </a-space>
    </div>

    <!-- 图片列表 -->
    <a-list
      :grid="{ gutter: 16, xs: 1, sm: 2, md: 3, lg: 4, xl: 5, xxl: 6 }"
      :data-source="dataList"
      :pagination="pagination"
      :loading="loading"
    >
      <template #renderItem="{ item: picture }">
        <a-list-item style="padding: 0">
          <!-- 单张图片 -->
          <a-card hoverable @click="doClickPicture(picture)">
            <template #cover>
              <img
                style="height: 180px; object-fit: cover"
                :alt="picture.name"
                :src="picture.url"
              />
            </template>
            <a-card-meta :title="picture.name">
              <template #description>
                <a-flex>
                  <a-tag color="green">
                    {{ picture.category ?? '默认' }}
                  </a-tag>
                  <a-tag v-for="tag in picture.tags" :key="tag">
                    {{ tag }}
                  </a-tag>
                </a-flex>
              </template>
            </a-card-meta>
          </a-card>
        </a-list-item>

      </template>
    </a-list>

  </div>

</template>

<script setup lang="ts">

import {computed, onMounted, reactive, ref} from "vue";
import {listPictureTagCategoryUsingGet, listPictureVoByPageUsingPost} from "@/api/fileController";
import {message} from "ant-design-vue";
import {useRouter} from "vue-router";


//定义数据
const dataList = ref<API.PictureVO[]>([])
const total = ref(0)
const loading = ref(true)

//搜索条件
const searchParams = reactive<API.PictureQueryRequest>({
  current: 1,
  pageSize: 10,
  sortField: 'createTime',
  sortOrder: 'descend',
})

//分页参数
const pagination = computed(()=>{
  return {
    current: searchParams.current ?? 1,
    pageSize: searchParams.pageSize ?? 10,
    total: total.value,
    //切换页号时，会修改搜索参数并获取数据
    onChange: (page, pageSize) => {
      searchParams.current = page
      searchParams.pageSize = pageSize
      fetchData()
    },
  }
})

//获取数据
const fetchData = async ()=>{
  loading.value = true
  //转换选中的分类和标签搜索参数
  const params = {...searchParams,tags:[],}
  if (selectedCategory.value !== 'all') {
    params.category = selectedCategory.value;
  }
  selectedTagList.value.forEach((useTag, index)=>{
    if (useTag) {
      params.tags.push(tagList.value[index])
    }
  })
  const res = await listPictureVoByPageUsingPost(params)
  if (res.data.data) {
    total.value = res.data.data.total ?? 0
    dataList.value = res.data.data.records ?? []
  }else {
    message.error('获取数据失败，' + res.data.message);
  }
  loading.value = false
}

//点击搜索按钮时，触发搜索事件
const doSearch = () => {
  // 重置搜索条件
  searchParams.current = 1
  fetchData()
}
//定义分类和标签列表和选中状态的分类和标签列表
const categoryList = ref<String[]>([]);
const tagList = ref<String[]>([]);
const selectedCategory = ref<String>('all');
const selectedTagList = ref<String[]>([]);

/**
 * 获取分类和标签列表
 */
const getTagCategoryOptions = async () =>{
  const res = await listPictureTagCategoryUsingGet();
  if (res.data.code === 0 && res.data.data){
    //转换成下拉选项组件接受的格式
    categoryList.value = res.data.data.categoryList ?? [];
    tagList.value = res.data.data.tagList ?? [];
  }else {
    message.error("加载分类标签失败，"+res.data.message);
  }
}

const router = useRouter()
// 跳转至图片详情
const doClickPicture = (picture) => {
  router.push({
    path: `/picture/${picture.id}`,
  })
}


//页面加载时执行一次
onMounted(() => {
  fetchData()
  getTagCategoryOptions()
})


</script>

<style scoped>
#homePage .search-bar {
  max-width: 480px;
  margin: 0 auto 16px;
}
#homePage .tag-bar {
  margin-bottom: 16px;
}
</style>
